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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410a2c70fe5a0a5a53e98dc39fc59418aa818083579cb0cff8bd8498234d1f58' 
  AND token = '0RLM4t0iLcwb7jE9XE5eY/rd02u4l80c5tMvL3OWByo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}